add checks on ImageUtils instances

[nikiroo-utils.git] / src / be / nikiroo / utils / android / ImageUtilsAndroid.java

package be.nikiroo.utils.android;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import be.nikiroo.utils.Image;
import be.nikiroo.utils.ImageUtils;
import be.nikiroo.utils.StringUtils;

/**
 * This class offer some utilities based around images and uses the Android
 * framework.
 * 
 * @author niki
 */
public class ImageUtilsAndroid extends ImageUtils {
	@Override
	protected boolean check() {
		// If we can get the class, it means we have access to it
		@SuppressWarnings("unused")
		Object test = Bitmap.class;
		return true;
	}
	
	@Override
	public void saveAsImage(Image img, File target, String format)
			throws IOException {
		FileOutputStream fos = new FileOutputStream(target);
		try {
			Bitmap image = fromImage(img);

			boolean ok = false;
			try {
				ok = image.compress(
						Bitmap.CompressFormat.valueOf(format.toUpperCase()),
						90, fos);
			} catch (Exception e) {
				ok = false;
			}

			// Some formats are not reliable
			// Second change: PNG
			if (!ok && !format.equals("png")) {
				ok = image.compress(Bitmap.CompressFormat.PNG, 90, fos);
			}

			if (!ok) {
				throw new IOException(
						"Cannot find a writer for this image and format: "
								+ format);
			}
		} catch (IOException e) {
			throw new IOException("Cannot write image to " + target, e);
		} finally {
			fos.close();
		}
	}

	/**
	 * Convert the given {@link Image} into a {@link Bitmap} object.
	 * 
	 * @param img
	 *            the {@link Image}
	 * @return the {@link Image} object
	 * @throws IOException
	 *             in case of IO error
	 */
	static public Bitmap fromImage(Image img) throws IOException {
		byte[] array = img.getData();
		int size = array.length;
		// TODO: check if we can use a stream, too
		Bitmap image = BitmapFactory.decodeByteArray(array, 0, size);
		if (image == null) {
			String ssize = StringUtils.formatNumber(size);
			throw new IOException(
					"Failed to convert input to image, size was: " + ssize);
		}

		return image;
	}
}